1x1+1x1=多少?
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1x1+1x1=多少?
1x1+1x1=多少?
1x1+1x1=多少?
2……
1x1+1x1=多少?
1x1=多少
-1X1等于多少
1x1等于多少
1+1-1x1=多少呢?
1x1=什么
1X1=?为什么?
1x1=?
1x1/2+1/2x1/3+1/3x1/4+.+1/19x1/20=?
(-1x1/2)+(-1/2x1/3)+(-1/3x1/4)+...+(-1/2004x1/2005)=?
疑难数学问题火急求助x1^3-3x1^2+2x1+x2→x1(x1^2-2x1+2-x1)+x2→x1(3-x1)+x2 (怎么算出3-X1的)→3x1-x1^2+x2=2x1-x^2+x1+x2=-(x^2-2x1)+x1+x2=-1+2=1
1+1x1-1+1x1 等于多少?
(-1x1/2)+(-1/2x1/3)+.+(-1/2011x1/2011)等于多少
(-1x1/2)+(-1/2x1/3)+.+(-1/2011x1/2011)等于多少
数学题1/4x1/5x1/6+1/5x1/6x1/7+1/6x1/7x1/8+.+1/98×1/99×1/100=?
1,x1,x2...Xn,成等比数列,x1 x2..xn>0,x1*x2*...xn=?x1,x2...Xn,2成等比数列,x1 x2..xn>0,x1*x2*...xn=?
纺织机械 4x1 1511 single channel .56” 4x1 .1x1 这个4x1 1x1
41.8x8.1+11x1.25+53.7x1.9=?